@Kevin_Z Thank you for the response. I did the configuration exactly as descrived in the instructions. Doing it that way, internet only works activating the roaming and only connects to 3G. The thing is that the router detects the connection correctly the first time I boot it and I can connect to 4G, but as after rebooting it, it loads another ISP's configuration and it stops working until I configure it manually and enable the roaming. I've checked the firmware version and it sais it is already updated.